Winter pollution in Delhi is primarily attributed to the formation of a strong atmospheric temperature inversion layer near the surface, which traps pollutants close to the ground and prevents their vertical dispersion, combined with generally calmer winter winds, rather than being primarily caused by increased vehicle numbers, wind direction alone, or biomass burning (though these do contribute to the pollutant load).
During winter, especially on clear, calm nights, strong radiative cooling of the ground surface creates a shallow, stable temperature inversion layer near the surface, in...
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